Method and apparatus for transmitting and receiving signals in a wireless communication system

Abstract

A method and apparatus for transmitting and receiving signals in a wireless communication system according to the present invention performs uplink switching between three or more bands, where an uplink switching gap is set to the maximum value among the switching intervals for each associated band pair.

Description

[Technical Field]

[0001] The present invention relates to a method and apparatus for use in a wireless communication system. [Background technology]

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. Generally, wireless communication systems are multiple access systems that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). Examples of multiple access systems include Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, and Single Carrier Frequency Division Multiple Access (SC-FDMA) systems. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem to be solved by the present invention is to provide a method and apparatus for efficiently transmitting and receiving wireless communication signals.

[0004] The technical object of the present invention is not limited to the above-mentioned technical object, and other technical objects can be inferred from the embodiments of the present invention. [Means for solving the problem]

[0005] The present invention provides a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0006] As one embodiment of the present invention, there is provided a method for a terminal (UE) to transmit and receive signals in a wireless communication system, the method including: indicating capabilities for a switching period AB for a band pair including band A and band B and a switching period AC for a band pair including band A and band C; and performing a two-port transmission on a carrier of band A and then a one-port transmission on each carrier of band B and band C, wherein during an uplink switching gap, the two-port transmission on the carrier of band A and the one-port transmission on each carrier of band B and band C are omitted, and the uplink switching gap is the maximum value of the switching period AB and the switching period AC.

[0007] As another embodiment of the present invention, there is provided a method for a base station (BS) to transmit and receive signals in a wireless communication system, the method including the steps of: indicating from a terminal a capability for a switching period AB for a band pair including band A and band B and a switching period AC for a band pair including band A and band C; and receiving a 2-port transmission on a carrier of band A from the terminal, and then receiving a 1-port transmission on each carrier of band B and band C from the terminal, wherein during an uplink switching gap, the 2-port transmission on the carrier of band A and the 1-port transmission on each carrier of band B and band C are omitted, and the uplink switching gap is the maximum value of the switching period AB and the switching period AC.

[0008] In another embodiment of the present invention, an apparatus, a processor, and a storage medium for performing a signal transmission and reception method are provided.

[0009] The device includes an autonomous vehicle capable of communicating with at least a terminal, a network, and other autonomous vehicles other than the device.

[0010] The above-described aspects of the present invention are merely some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be apparent to those skilled in the art based on the detailed description of the present invention below. [Effects of the Invention]

[0011] According to one embodiment of the present invention, when signals are transmitted and received between communication devices, there is an advantage that signals can be transmitted and received more efficiently due to an operation that is differentiated from the conventional invention.

[0012] The technical effects of the present invention are not limited to the above-mentioned technical effects, and other technical effects may be inferred from the embodiments of the present invention. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating the structure of a radio frame. [Figure 2] FIG. 1 illustrates a resource grid of slots. [Figure 3] FIG. 10 is a diagram showing an example of mapping physical channels within a slot. [Figure 4] FIG. 2 is a diagram illustrating an example of a signal transmission and reception method according to an embodiment of the present invention. [Figure 5] FIG. 2 is a diagram illustrating an example of a signal transmission and reception method according to an embodiment of the present invention. [Figure 6] FIG. 2 is a diagram illustrating an example of a signal transmission and reception method according to an embodiment of the present invention. [Figure 7] 1 illustrates an apparatus according to one embodiment of the present invention. [Figure 8] 1 illustrates an apparatus according to one embodiment of the present invention. [Figure 9] 1 illustrates an apparatus according to one embodiment of the present invention. [Figure 10] 1 illustrates an apparatus according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following technologies can be used for various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented by radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA can be implemented by radio technologies such as GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (registered trademark) 3rd Generation Partnership Project) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A / LTE-A pro are evolved versions of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0015] For clarity, the following description will be based on a 3GPP communication system (e.g., LTE-A, NR), but the technical concept of the present invention is not limited thereto. LTE refers to technology from 3GPP TS 36.xxx Release 8 onward. Specifically, LTE technology from 3GPP TS 36.xxx Release 10 onward is called LTE-A, and LTE technology from 3GPP TS 36.xxx Release 13 onward is called LTE-A pro. 3GPP NR refers to technology from TS 38.xxx Release 15 onward. LTE / NR can also be referred to as a 3GPP system. "xxx" refers to the specific number of the standard document. LTE / NR is collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, please refer to the matters described in standard documents published before the present invention. For example, the following documents may be referenced:

[0016] 3GPP NR

[0017] - 38.211: Physical channels and modulation

[0018] - 38.212: Multiplexing and channel coding

[0019] - 38.213: Physical layer procedures for control

[0020] - 38.214: Physical layer procedures for data

[0021] - 38.300: NR and NG-RAN Overall Description

[0022] - 38.331: Radio Resource Control (RRC) protocol specification

[0023] FIG. 1 illustrates the structure of a radio frame used in NR.

[0024] In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (Half-Frame, HF). A half-frame is defined as five 1 ms subframes (Subframe, SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). If a regular CP is used, each slot contains 14 symbols. If an extended CP is used, each slot contains 12 symbols. Here, a symbol can include an OFDM symbol (or a CP-OFDM symbol) or an SC-FDMA symbol (or a DFT-s-OFDM symbol).

[0025] Table 1 illustrates that when a general CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS.

[0026] [Table 1]

[0027] Table 2 illustrates how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS when an extended CP is used.

[0028] [Table 2]

[0029] In an NR system, multiple cells merged to one user equipment (UE) are configured to have different OFDM(A) pneumatics (e.g., SCS, CP length, etc.), which results in different (absolute time) durations of time resources (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) consisting of the same number of symbols.

[0030] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) pneumonologies (e.g., subcarrier spacing, SCS) to support various 5G services. For example, a 15 kHz SCS supports wide areas in traditional cellular bands, while a 30 kHz / 60 kHz SCS supports dense urban areas, lower latency, and wider carrier bandwidths.

[0031] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 are configured as shown in Table 3 below. FR2 also stands for millimeter wave (mmW).

[0032] [Table 3]

[0033] Figure 2 illustrates the slot structure of an NR frame.

[0034] A slot contains multiple symbols in the time domain. For example, in the case of a general CP, one slot contains 14 symbols, while in the case of an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interlaces (or simply, interlaces) are defined in the frequency domain. Interlace m ∈ {0, 1, ..., M-1} consists of (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M represents the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive PRBs (Physical RBs) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier contains up to N BWPs (e.g., 5). Data communication is performed using activated BWPs, and only one BWP can be activated for one terminal. Each element in the resource grid is called a resource element (RE), and one modulation symbol can be mapped to it.

[0035] In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and the terminal transmits information to the base station via an uplink (UL). Information exchanged between the base station and the terminal includes data and various control information, and various physical channels / signals exist depending on the type / purpose of the information exchanged. A physical channel corresponds to a set of resource elements (RE) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (RE) used by a physical layer (PHY), but does not carry information derived from a higher layer. Higher layers include a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, etc.

[0036] DL physical channels include PBCH (Physical Broadcast channel), PDSCH (Physical Downlink Shared channel), and PDCCH (Physical Downlink Control channel). DL physical signals include DL RS (Reference Signal), PSS (Primary synchronization signal), and SSS (Secondary synchronization signal). DL RSs include DM-RS (Demodulation RS), PT-RS (Phase-tracking RS), and CSI-RS (Channel-state information RS). UL physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel). UL physical signals include UL RSs. UL RSs include DM-RS, PT-RS, and SRS (Sounding RS).

[0037] FIG. 3 shows an example of mapping physical channels into slots.

[0038] A single slot contains the DL control channel, DL or UL data, and UL control channel. For example, the first N symbols in a slot are used to transmit the DL control channel (hereinafter referred to as the DL control region), and the last M symbols in a slot are used to transmit the UL control channel (hereinafter referred to as the UL control region). N and M are integers equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter referred to as the data region) is used to transmit DL data or UL data. A time gap exists between the control region and the data region for DL-to-UL or UL-to-DL switching. The PDCCH is transmitted in the DL control region, and the PDSCH is transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot are used as the time gap.

[0039] The base station is, for example, a gNodeB.

[0040] Uplink (UL) physical channels / signals

[0041] (1) PUSCH

[0042] The PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI) and is transmitted based on a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the terminal applies transform precoding to transmit the PUSCH. For example, when transform precoding is not possible (e.g., transform precoding is disabled), the terminal transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the terminal transmits the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. The PUSCH is dynamically scheduled by the PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PUSCH transmission is accompanied by the PDCCH, while in CS, PUSCH transmission is not accompanied by the PDCCH. CS includes Type-1 CG (Configured Grant) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by a higher layer. In Type-2 CG, some parameters for PUSCH transmission are signaled by a higher layer, and the rest are signaled by the PDCCH. Basically, in CS, PUSCH transmission is not accompanied by the PDCCH.

[0043] (2) PUCCH

[0044] The PUCCH carries Uplink Control Information (UCI), which includes:

[0045] - SR (Scheduling Request): Information used to request UL-SCH resources

[0046] - HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): A reception acknowledgement signal for DL signals (e.g., PDSCH, SPS release PDCCH). HARQ-ACK responses include positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission), or NACK / DTX. HARQ-ACK is also used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK is generated on a TB-by-TB / CBG-by-CBG basis.

[0047] CSI (Channel Status Information): Feedback information for the DL channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), etc.

[0048] Table 4 shows examples of PUCCH formats. PUCCH formats are classified according to the size of the UCI payload, transmission length (e.g., the number of symbols constituting the PUCCH resource), and transmission structure. PUCCH formats are classified into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4) according to the transmission length.

[0049] [Table 4]

[0050] (0) PUCCH Format 0 (PF0)

[0051] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0052] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

[0053] - Transmission structure: Consists of only UCI signals without DM-RS, and transmits UCI status by selecting and transmitting one of multiple sequences.

[0054] (1) PUCCH Format 1 (PF1)

[0055] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0056] Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0057] - Transmission structure: DM-RS and UCI are configured in TDM format on different OFDM symbols, and UCI is a form in which a specific sequence is modulated (e.g., QPSK) symbols are multiplied. CS (cyclic shift) / OCC (orthogonal cover code) is applied to both UCI and DM-RS, and CDM is supported between multiple PUCCH resources (according to PUCCH format 1) (within the same RB).

[0058] (2) PUCCH Format 2 (PF2)

[0059] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0060] - Number of OFDM symbols constituting a single PUCCH: 1 to x symbols (e.g., X = 2)

[0061] - Transmission structure: DMRS and UCI are configured / mapped in the same symbol in the form of FDM, and the coded UCI bits are transmitted by applying only IFFT without DFT.

[0062] (3) PUCCH Format 3 (PF3)

[0063] - Supported UCI payload size: K bits or more (e.g., K=2)

[0064] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0065] - Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and the coded UCI bits are transmitted after applying DFT. OCC is applied to UCI before DFT, and CS (or IFDM mapping) is applied to DMRS, supporting multiplexing to multiple terminals.

[0066] (4) PUCCH Format 4 (PF4 or F4)

[0067] - Supported UCI payload size: K bits or more (e.g., K=2)

[0068] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0069] Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and the coded UCI bits are transmitted without inter-terminal multiplexing by applying DFT.

[0070] 4 illustrates an ACK / NACK transmission process. Referring to FIG. 4, a UE detects a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI format 1_0, 1_1), and indicates a DL allocation-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1). For example, DCI formats 1_0, 1_1 include the following information:

[0071] - Frequency domain resource assignment: Indicates the RB set assigned to the PDSCH.

[0072] - Time domain resource assignment: K0, indicates the starting position (e.g. OFDM symbol index) and length (e.g. number of OFDM symbols) of the PDSCH within the slot.

[0073] - PDSCH-to-HARQ_feedback timing indicator: Indicates K1.

[0074] Here, the UE receives the PDSCH in slot #(n+K0) according to the scheduling information of slot #n, and then transmits UCI via the PUCCH in slot #(n+K1). Here, the UCI includes a HARQ-ACK response for the PDSCH. If the PDSCH is configured to transmit up to one TB, the HARQ-ACK response consists of 1 bit. If the PDSCH is configured to transmit up to two TBs, the HARQ-ACK response consists of 2 bits if spatial bundling is not configured, and 1 bit if spatial bundling is configured. If the transmission time of the HARQ-ACK for multiple PDSCHs is specified as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes a HARQ-ACK response for multiple PDSCHs.

[0075] Uplink switching with 3 or 4 uplink bands

[0076] The above content can be applied in combination with the method proposed in the present invention to be described later, or is supplemented to clarify the technical features of the method proposed in the present invention.

[0077] In addition, the method described below can be similarly applied to the aforementioned NR system (licensed band) or shared spectrum, and of course can be modified or substituted according to the terms, expressions, structures, etc. defined in each system so that the technical ideas proposed in the present invention can be embodied in those systems as well.

[0078] Generally, the number of antennas that can be installed in a UE is limited due to its size. A UE with N transmit chains via N antennas can simultaneously support up to N single-port UL transmissions or up to N-port UL transmissions. A method for supporting UEs with limited transmit chains to efficiently perform UL transmissions is required. Hereinafter, an embodiment of the present invention related to UL transmission (Tx) switching will be described. Since most UEs developed to date support up to two Tx chains, the following description will be given assuming that the UE supports up to two Tx chains, i.e., UL transmission via up to two ports. However, the embodiment of the present invention is not limited to single-port or two-port UL transmission, and can also be applied to N-port UL transmission, where N is greater than 2.

[0079] FIG. 4 is a diagram illustrating the concept of uplink transmission switching.

[0080] To increase the throughput and efficiency of UL transmission, NR Rel-16 specifies UL Tx Switching (UTS), which switches Tx chains connected to UL carriers under predetermined conditions, with the aim of enabling a UE to effectively perform 1-port UL transmission or 2-port UL transmission using up to two Tx chains. Figure 4(a) shows 1Tx-2Tx switching between two carriers / bands, and Figure 4(b) shows 2Tx-2Tx switching between two carriers / bands.

[0081] For example, if UL transmission (hereinafter referred to as the previous transmission) is performed using one Tx chain on carrier #1, and then UL transmission (hereinafter referred to as the current transmission) is configured / instructed to be performed using two Tx chains on carrier #2, the UE switches the Tx chain connected to carrier #1 to carrier #2, enabling two-port UL transmission on carrier #2. This UTS configuration and switching method can be applied to band combinations corresponding to EN-DC (Evolved-Universal Terrestrial Radio Access New-Radio - Dual Connectivity) without supplementary UL (SUL), standalone SUL, and inter-band CA. NR Rel-17 introduces additional conditions to extend the 1Tx-2Tx switching (i.e., switching between 1Tx chain and 2Tx chain) of the conventional NR Rel-16 to 2Tx-2Tx switching (i.e., switching between 2Tx chain and 2Tx chain), and at the same time, extends the UTS between two carriers introduced in NR Rel-16 to also be performed between two different bands (e.g., one carrier in one band and two contiguous carriers in another band).

[0082] If a predetermined condition is met and the UE is configured for uplinkTxSwitching via RRC signaling, the UE may omit uplink transmission during an uplink switching gap NTx1-Tx2. For example, if a predetermined condition is met and the UE is configured for uplinkTxSwitching via RRC signaling, the UE may omit uplink transmission during an uplink switching gap NTx1-Tx2. Tx1-Tx2During this period, all UL transmissions, including UL transmissions scheduled via DCI and UL transmissions configured via higher layer signaling (e.g., configured grant-based PUSCH), are omitted. The switching gap NTx1-Tx2 is indicated by uplinkTxSwitchingPeriod2T2T provided from the UE to the BS via a UE capability report if uplinkTxSwitching-2T-Mode is configured via RRC signaling; otherwise, it is indicated by uplinkTxSwitchingPeriod provided from the UE to the BS via a UE capability report. Here, the RRC configuration uplinkTxSwitching is included in the configuration for the serving cell and provided to the UE, and may include uplinkTxSwitchingPeriodLocation indicating whether the location of the UL Tx switching period is configured on this UL carrier in the case of inter-band UL CA, SUL, or (NG)EN-DC, and uplinkTxSwitchingCarrier indicating that the configured carrier is carrier 1 or carrier 2 for dynamic UL Tx switching. The RRC parameter uplinkTxSwitching-2T-Mode indicates that 2Tx-2Tx switching mode is configured for inter-band UL CA or SUL, in which case the switching gap duration for triggered UL switching is equal to the switching time capability value reported for the switching mode. If the RRC parameter uplinkTxSwitching-2T-Mode is not provided and uplinkTxSwitching is configured, it can be interpreted as 1Tx-2Tx UTS being configured, in which case there can be one uplink (or one uplink band in the case of intra-band) configured for uplinkTxSwitching.

[0083] If the UE indicates capability for uplink switching for a band combination, and if that band combination is configured for MCG using E-UTRA radio access and SCG using NR radio access, or configured for uplink CA, or configured for a serving cell with two UL carriers in the upper layer (e.g., RRC) parameter supplementaryUplink, the switching gap may exist under certain conditions. For example, the following table is excerpted from 3GPP TS 38.214 V17.1.0 and illustrates UTS conditions.

[0084] Uplink switching is T0-T offset The UE is not expected to cancel the uplink switching if triggered for uplink transmission starting from T0, or T0-T offset Any other uplink transmission scheduled later is not expected to trigger any other new uplink switching that occurs before T0. offset is the UE processing procedure time defined for uplink transmission that triggers switching (see, for example, S5.3, S5.4, S6.2.1 and S6.4 of 3GPP TS 38.214 and S9 of 3GPP TS 38.213). UL =max(u UL,1 ,u UL,2 ), where u UL,1 corresponds to the subcarrier spacing of the active UL BWP of the uplink carrier occurring before the switching gap, and u UL,2 corresponds to the subcarrier spacing of the active UL BWP of another uplink carrier occurring after the switching gap.

[0085] [Table 5]

[0086] [Table 6]

[0087] [Table 7]

[0088] NR supports wide spectrum in various frequency ranges. Spectrum availability is expected to increase with the evolution of 5G due to the realignment of bands originally used in previous cellular generation networks. In particular, for the low-frequency FR1 band, available spectrum blocks tend to be more fragmented and distributed over narrower bandwidths. For FR2 bands and some FR1 bands, the available spectrum may be even wider, necessitating the operation of multiple carriers within the band. To meet various spectrum requirements, it is important to utilize these distributed spectrum bands or wider bandwidth spectrum in a more spectrally / power-efficient and flexible manner to provide higher throughput and more appropriate coverage in the network. For multi-carrier UL operation, the current specification has some limitations. For example, a 2TX UE is configured with a maximum of two UL bands, which can be changed only by RRC reconfiguration, and UL Tx switching is only performed between the two UL bands for a 2TX UE. Instead of RRC-based cell reconfiguration, dynamically selecting carriers with UL Tx switching based on, for example, data traffic, TDD DL / UL configuration, bandwidth and channel conditions of each band, potentially leads to even higher UL data rates, spectrum utilization and UE capacity.

[0089] For higher UL data rates, spectrum utilization, and UE capacity, UTS between more than two bands is being considered. The following describes UTS trigger conditions, UTS-related configuration methods, and / or UTS operation methods required to support UTS between multiple bands (e.g., three or more bands) according to some embodiments of the present invention.

[0090] Hereinafter, the term "cell" will be interpreted according to the context. For example, a cell may refer to a serving cell. Also, a cell may consist of one DL component carrier (CC) and zero to two UL CCs, but the embodiments of the present invention described below are not limited thereto. Hereinafter, unless otherwise specified, the terms "cell" and "CC" may be used interchangeably. Also, in some embodiments of the present invention, a cell / CC may be applied to replace an (active) BWP in a serving cell. Also, unless otherwise specified, in the embodiments of the present invention described below, a cell / CC may be used as a comprehensive concept for a PCell, SCell, PsCell, etc. configured / expressed in a carrier aggregation (CA) / dual connectivity (DC) scenario.

[0091] Hereinafter, the term "band" refers to a frequency band, and the term "band" can be used interchangeably with the terms "carrier" and / or "cell" within the band. Herein, each band consists of one carrier or multiple (e.g., two) contiguous (or non-contiguous) carriers. Furthermore, the proposed method described below (unless otherwise restricted) is applicable to inter-band UL CA, intra-band UL CA, NR-DC, EN-DC, and (single) SUL scenarios, and their associated band combinations.

[0092] In the implementation of the present invention described below, the following notation will be used for convenience of explanation.

[0093] - When a UTS occurs, it is referred to as a UTS triggered event.

[0094] - Bands (or carriers) associated with UTS: refers to bands / carriers before and after UTS occurs.

[0095] - The Tx chain transition time caused by UTS is called a UTS gap (or UTS period). During the UTS gap, no UL transmission occurs in the band / carrier related to UTS. The UTS gap (switching gap) and UTS period (switching period) are specifically divided as follows:

[0096] □ Switching period: Switching time reported by the terminal. Basically, one of the values {35us, 140us, 210us} is reported in units of a band pair consisting of two bands. For a given switching case, one value is reported in units of a band combination consisting of three or more bands. In this invention, it is also referred to as UTS period / period or switching period.

[0097] □ Switching gap: The time duration during which UL transmission in all (or some) of the bands associated with a single UL Tx switching event is restricted. The switching gap is determined by the switching interval (reported by the terminal) for that Tx switching, or by using the switching intervals of each band pair associated with that Tx switching.

[0098] For example, in a state where one Tx chain is connected to band A and one Tx chain is connected to band B, in the case of A(1T)+B(1T)->C(2T) switching in which transmission using two Tx chains occurs in band C, if the band combination {A+B, C} is reported by the terminal, the switching gap is determined to be the reported value. If not reported, the switching gap is determined to be a value derived using a switching period AB (period_AB) for the band pair including bands A and B and a switching period AC (period_AC) for the band pair including bands A and C. In the present invention, it is also referred to as a UTS gap / interval or a switching interval.

[0099] - A 1Tx chain is written as 1T, and a 2Tx chain is written as 2T.

[0100] - 1-port UL transmission is designated as 1p, and 2-port UL transmission is designated as 2p.

[0101] - When 1 Tx chain or 2 Tx chains are connected to a given band A (and / or carriers belonging to band A), this state is represented as A(1T) and A(2T), respectively.

[0102] - When one Tx chain is connected to each of two given bands A (and / or carriers belonging to band A) and band B (and / or carriers belonging to band A), this state is expressed as A(1T) + B(1T).

[0103] UL transmission means any UL channel or UL signal supported in NR, etc.

[0104] - "Previous transmission" means the most recent UL transmission performed by the UE before the UTS triggering, and "current transmission" can mean the UL transmission performed by the UE immediately after (or simultaneously with) the UTS triggering. Also, in the following, "transmission" can mean "UL transmission".

[0105] The expression that a UL transmission has occurred may refer to a UL transmission scheduled via a DCI for a UL grant and / or a UL transmission configured via higher layer signaling (e.g., RRC signaling) (e.g., a configured grant UL transmission).

[0106] - When a 1-port UL transmission occurs in a given band A (and / or a carrier belonging to band A), it is denoted as A(1p), and when a 2-port UL transmission occurs, it is denoted as A(2p).

[0107] - When one-port UL transmission occurs in each of two given bands, e.g., band A and band B (and / or carriers belonging to those bands), it is written as A(1p)+B(1p).

[0108] Specific examples

[0109] When three bands A, B, and C are configured in a terminal and UL Tx switching is configured in these bands, the switching periods for each of the band pairs {A,B}, {B,C}, and {A,C} are reported (by the terminal to the base station). These are denoted as period_AB, period_BC, and period_AC, respectively.

[0110] Case 1: For UL Tx switching where 2Tx switches from A to B, the switching gap is determined to be period_AB.

[0111] Some embodiments of the present invention described below will be described focusing on UTS occurring between two bands when four bands / carriers are configured (or activated). However, the same method as the embodiments of the present invention described below can also be applied to UTS occurring when a smaller number of bands (e.g., three) are configured / activated. The same method as the embodiments of the present invention described below can also be applied to UTS occurring when a larger number of bands (e.g., five) are configured / activated.

[0112] Some embodiments of the present invention will be described below without distinguishing between 1Tx-2Tx switching and 2Tx-2Tx switching, although some embodiments may be specifically applicable to 1Tx-2Tx switching and / or 2Tx-2Tx switching.

[0113] In some implementations of the present invention described below, the occurrence of "simultaneous transmission" in multiple bands may mean that the start time (e.g., start symbol) of UL transmission in each of the multiple bands coincides, and / or that some (or all) of the UL transmission resources / periods in each of the multiple bands overlap in time.

[0114] [1] How to apply the switching gap when Tx switching occurs in two bands due to one-port UL transmission scheduled or configured in each of the two bands.

[0115] [1-1] When one-port UL transmission occurs in each of two UL bands in which no Tx chains are connected (or configured), the Tx chains can be switched for UL transmission in the two bands. For example, when two Tx chains are connected to bands other than band A and band B (or two other bands), and one-port UL transmission occurs in each of band A and band B (for example, when one-port UL transmission is scheduled for the band via DCI or when one-port UL transmission is configured for the band), one Tx chain is switched to each of band A and band B.

[0116] [1-2] In NR Rel-16 / 17, Tx switching is assumed to operate within two bands, and therefore conventional Tx chains are switched only within those two bands. Therefore, for any conventional Tx switching, there is always one switch-to band. The switch-to band is the band to which a Tx chain from another band is switched and moved, and refers to the band to which the Tx chain is connected after Tx switching. The switch-from band is the band before the Tx chain is switched and moved, and refers to the band to which the Tx chain was connected before Tx switching. However, if Tx switching occurs for three (or four) bands, there will be two switch-to bands, and Tx switching can be triggered in each of two different bands, as in the situation in [1-1]. This allows the Tx switching operation and the UL transmission after switching to operate differently depending on whether the UTS gaps required for Tx switching generated from the two bands are the same and / or whether the start times of UL transmissions generated from the two bands coincide.

[0117] [1-3] On the other hand, when multiple UL bands are configured in a terminal, if a Tx chain is switched from a specific band to another specific band, UL transmission is not allowed in the two bands during the UTS gap. In this case, UL transmission may not be allowed (referred to as "Configuration 1") or may be allowed (referred to as "Configuration 2") during the gap in the other specific band configured in the terminal. For example, if bands A, B, and C exist and a Tx chain is switched from band A to band B, UL transmission is not allowed in band A, which is the switch-from band, and band B, which is the switch-to band, during the UTS gap. In this case, if configuration 1 is applied to bands C and D, UL transmission is not allowed, but if configuration 2 is applied, UL transmission is allowed.

[0118] [1-4] When one-port UL transmission occurs in each of two UL bands without Tx chains connected (or configured), and UTS is triggered in the two bands, if the start times of the UL transmissions in the two bands are the same, the UTS gaps applied for the UL transmissions in each band may overlap. In this case, if the UTS gap lengths configured (or reported by the UE) for each of the two bands are the same, the UTS gaps applied to the two bands may be the same interval. However, if the UTS gap lengths configured (or reported by the UE) for each of the two bands are different (for example, if the UTS gaps are gap_1 and gap_2), the UTS gaps are applied in one of the following two ways:

[0119] Method 1: In the case of [Setting 1] disclosed in [1-3], a UTS gap of length max{gap_1, gap_2} (i.e., the maximum value of gap1 and gap2) is set and applied to the two bands (as a common UTS gap) so that the UTS gaps applied to the two bands overlap as much as possible.

[0120] Method 2: In the case of [Configuration 2] disclosed in [1-3], Opt 1) the UTS gap set (or reported) for each band is applied to that band. Alternatively, in this case, Opt 2) a UTS gap of max{gap_1, gap_2} length is set and applied to the two bands (a common UTS gap). Alternatively, in this case, whether to apply Opt 1 or Opt 2 is configured / instructed via RRC, MAC-CE, etc.

[0121] Method 3: In the case of [Setting 2] disclosed in [1-3], one of the following methods is applied (in this case, the switching interval set or reported for each band pair follows the notation in [2-3]):

[0122] The method described below will be explained assuming a "switching case: Band A (T) + Band B (1T) -> Band C (1P) + Band D (1P)". Here, Band A / B / C / D (not meaning a specific frequency band) means a switch-from band or a switch-to band for any UL Tx switching (i.e., the band where the Tx chain was located before Tx switching, or the band where the Tx chain will be located after switching). In the method described below, Band A / B means a switch-from band, and Band C / D means a switch-to band.

[0123] When a switching period is set to be applied to band A and / or band B,

[0124] - Alt-1: For band A, G1=max{period(A,C),period(A,D)} length is determined as the switching section

[0125] - Alt-2: For band B, G2=max{period(B,C),period(B,D)} length is determined as the switching section

[0126] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0127] - Alt-1 is applied to band A, and Alt-2 is applied (independently) to band B. In this case, G1 or G2 is applied (independently) to band A and band B at different times. Alternatively, G1 is applied to band A and G2 is applied to band B at the same time (here, the same time means that the start time or end time of G1 and G2 are the same).

[0128] - The same length min{G1, G2} is applied to band A and band B. In this case, min{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, min{G1, G2} is applied to band A and band B at the same timing.

[0129] - The same length max{G1, G2} is applied to band A and band B. In this case, max{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, max{G1, G2} is applied to band A and band B at the same timing.

[0130] When the switching interval is set to apply to band C and / or band D,

[0131] - Alt-3: For band C, G3=max{period(A,C),period(B,C)} length is determined as the switching interval

[0132] - Alt-4: For band D, G4=max{period(A,D),period(B,D)} length is determined as the switching interval

[0133] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0134] - Alt-3 is applied to band C, and Alt-4 is applied (independently) to band D. In this case, G3 or G4 is applied (independently) to band C and band D at different times. Alternatively, G3 is applied to band C and G4 is applied to band D at the same time (here, the same time means that the start time or end time of G3 and G4 are the same).

[0135] - The same length min{G3, G4} is applied to bands C and D. In this case, min{G3, G4} is applied (independently) to bands C and D at different timings, or min{G3, G4} is applied to bands C and D at the same timing.

[0136] - The same length max{G3, G4} is applied to bands C and D. In this case, max{G3, G4} is applied (independently) to bands C and D at different times, or max{G3, G4} is applied to bands C and D at the same time.

[0137] [1-5] When one-port UL transmission occurs in each of two UL bands with no Tx chains connected (or configured), triggering UTS in the two bands, if the transmission periods of the UL transmissions of the two bands overlap, a UTS gap is applied in one of the following ways: (In this case, overlapping of the UL transmission periods can mean that the UL transmissions of the two bands overlap in whole or in part. For example, (when the start times of the UL transmissions of the two bands are different) this applies when the UL transmission period with the later start time starts before the UL transmission period with the earlier start time ends. Or, this applies when the start times of the UL transmissions of the two bands are the same, but the lengths of the UL transmission periods are different.)

[0138] Method 1: Of two UL transmissions, a UTS gap is applied to the earlier UL transmission (starting time), and the later UL transmission (starting time) is dropped, or the UE does not expect two UL transmissions that fall into this relationship to occur.

[0139] Method 2: A UTS gap is applied to the earlier UL transmission (starting point) of two UL transmissions, and the Tx chain is switched in the UTS gap section (applied to the earlier UL transmission) even in the band of the later UL transmission (starting point). That is, for the later UL transmission band, the UTS gap section for switching the Tx chain does not need to overlap with the UL transmission section, and the gap and the UL transmission section can be separated by more than a few symbols.

[0140] Method 3: If the UTS gaps (e.g., gap_1 and gap_2) configured (or reported) for each of the two bands are different, a UTS gap of "max(gap_1, gap_2)" length common to both bands is applied based on the "earliest UL transmission interval (starting point)." This method also includes the case where "max(gap_1, gap_2) = gap_1 = gap_2."

[0141] Alternatively, whether to apply Method 3 or another method (for example, Method 1) may be configured / instructed via RRC, MAC-CE, etc.

[0142] Method 4: If the UTS gaps (e.g., gap_1 and gap_2) configured (or reported) for each of the two bands are different, a UTS gap of "max(gap_1, gap_2)" length is applied to both bands based on the "start point of the earliest UL transmission interval" (or "start point of the earliest UL transmission slot"). This method also includes the case where "max(gap_1, gap_2) = gap_1 = gap_2".

[0143] Alternatively, whether to apply Method 4 or another method (for example, Method 1) may be configured / instructed via RRC, MAC-CE, etc.

[0144] Method 5: The UTS gaps (e.g., gap_1 and gap_2) set (or reported) for each of the two bands are set / applied to each band so that they are continuous. For example, the gap_1 interval is set to [t_a, t_b], and the gap_2 interval is set to [t_b, t_c], and they are set / applied so that [t_a, t_c] appears as one continuous gap. In this case, the time t_a (or t_b or t_c) may be set to be the start time of the earlier UL transmission (or the start time of the slot of the earlier UL transmission) of the two UL transmissions. For example, if the gap_1 interval applied to the earlier UL transmission is originally [t_a, t_b] and the gap_2 interval applied to the later UL transmission is [t_b+x, t_c+x], then the UTS operation and UL transmission are performed with the gap_2 interval changed to [t_b, t_c] (thereby changing to one continuous gap).

[0145] Method 6: Furthermore, (if configured to allow more than one UTS trigger during the length of one slot) each of the configured (or reported) UTS gaps (e.g., gap_1 and gap_2) for each of the two bands is applied independently to UL transmissions in the UL band.

[0146] In the situation of [1-5], similar to the method 3 of [1-4], the length of the switching interval and / or the application time of the switching interval are determined depending on whether the switching interval is set as a switch-from band or a switch-to band. This is proposed as the following method 7 (using the same expression as in [1-4]).

[0147] Method 7: In the case of [Setting 2] disclosed in [1-3], one of the following methods is applied (in this case, the switching interval set or reported for each band pair follows the notation in [2-3]):

[0148] The method described below will be explained assuming a "switching case: Band A (T) + Band B (1T) -> Band C (1P) + Band D (1P)." Here, Band A / B / C / D (not meaning a specific frequency band) means a switch-from band or a switch-to band for any UL Tx switching (i.e., the band where the Tx chain was located before Tx switching, or the band where the Tx chain will be located after switching). In the method described below, Band A / B means a switch-from band, and Band C / D means a switch-to band.

[0149] When a switching period is set to be applied to band A and / or band B,

[0150] - Alt-1: For band A, G1=max{period(A,C),period(A,D)} length is determined as the switching section

[0151] - Alt-2: For band B, G2=max{period(B,C),period(B,D)} length is determined as the switching section

[0152] Using the switching period, the switching period is applied to each band by one of the following methods (or the terminal reports one or more of the following methods that it prefers, (or) one of the following methods is configured in the terminal via RRC, etc.)

[0153] - Alt-1 is applied to band A, and Alt-2 is applied (independently) to band B. In this case, G1 or G2 is applied (independently) to band A and band B at different times. Alternatively, G1 is applied to band A and G2 is applied to band B at the same time (here, the same time means that the start time or end time of G1 and G2 are the same).

[0154] - The same length min{G1, G2} is applied to band A and band B. In this case, min{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, min{G1, G2} is applied to band A and band B at the same timing.

[0155] - The same length max{G1, G2} is applied to band A and band B. In this case, max{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, max{G1, G2} is applied to band A and band B at the same timing.

[0156] When the switching interval is set to apply to band C and / or band D,

[0157] - Alt-3: For band C, G3=max{period(A,C),period(B,C)} length is determined as the switching interval

[0158] - Alt-4: For band D, G4=max{period(A,D),period(B,D)} length is determined as the switching interval

[0159] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0160] - Alt-3 is applied to band C, and Alt-4 is applied (independently) to band D. In this case, G3 or G4 is applied (independently) to band C and band D at different times. Alternatively, G3 is applied to band C, and G4 is applied to band D at the same time (here, the same time means that the start time or end time of G3 and G4 are the same).

[0161] - The same length min{G3, G4} is applied to bands C and D. In this case, min{G3, G4} is applied (independently) to bands C and D at different timings. Alternatively, min{G3, G4} is applied to bands C and D at the same timing.

[0162] - The same length max{G3, G4} is applied to bands C and D. In this case, max{G3, G4} is applied (independently) to bands C and D at different times, or max{G3, G4} is applied to bands C and D at the same time.

[0163] [1-6] The proposed method described above is not limited to Tx switching cases / patterns with one-port UL transmission scheduled or configured for each of two bands, but can be applied to all Tx switching cases / patterns involving two or more band pairs. For example, when switching from A(1T)+B(1T) state to C(2T), if the switching periods reported for band pair {A,C} and band pair {B,C} are different, the larger value (=max) of the two determines the switching gap of the Tx switching.

[0164] [2] How to determine the switching gap in the case of Tx switching in multiple band pairs where different switching intervals are reported

[0165] [2-1] A UE configured for UL Tx switching can report the switching intervals required for Tx chain switching per band pair. For example, for four bands A, B, C, and D, the UE reports the switching intervals for six band pairs (i.e., {A,B}, {A,C}, {A,D}, {B,C}, {B,D}, and {C,D}). Meanwhile, when a Tx chain is switched in some of the bands (or band pairs) configured for the UE, UL transmissions in other bands (or band pairs) may be restricted during the switching interval. Thus, the time interval during which UL transmissions in all bands of the UE are restricted due to a given Tx switching case / pattern is referred to as the switching gap of that Tx switching. Therefore, if a given Tx switching case / pattern triggers switching in multiple band pairs and the switching intervals reported for each band pair are not identical, a method for determining the switching gap of that Tx switching is required.

[0166] [2-2] Recently, at the RAN4 standard meeting, it was agreed that when Tx switching occurs in two band pairs with different switching intervals, the larger value of the two switching intervals will be the switching gap of that Tx switching.

[0167] [2-3] In the following explanation, the following expressions are used:

[0168] - period(A,B) = reported switching period for band pair {A,B}

[0169] - period(A,C) = reported switching period for band pair {A,C}

[0170] - period(A,D) = reported switching period for band pair {A,D}

[0171] - period(B,C) = reported switching period for band pair {B,C}

[0172] - period(B,D) = reported switching period for band pair {B,D}

[0173] - period(C,D) = reported switching period for band pair {C,D}

[0174] Tx switching case / pattern: A(1T)+B(1T) -> C(1T)+D(1T)

[0175] [2-4] For a terminal configured with UL Tx switching in four bands (e.g., bands A, B, C, and D), if C(1p)+D(1p) occurs while in the A(1T)+B(1T) state, each of the two Txs will be switched to band C and band D. In this case, the Tx switching will be performed in one of two patterns (depending on the terminal) as follows:

[0176] Pattern 1: Tx in band A is switched to band C, and Tx in band B is switched to band D. In this case, the switching gap for that Tx switching is determined to be Max{period(A,C),period(B,D)}.

[0177] Pattern 2: Tx in band A is switched to band D, and Tx in band B is switched to band C. In this case, the switching gap for that Tx switching is determined to be Max{period(A,D),period(B,C)}.

[0178] [2-5] For the Tx switching in [2-4] above, the terminal determines the switching gap to be one of the following (unless configured / instructed to operate in either pattern 1 or pattern 2).

[0179] - switching_gap1=min{Max{period(A,C),period(B,D)},Max{period(A,D),period(B,C)}}

[0180] - switching_gap2=Max{period(A,C),period(B,D),period(A,D),period(B,C)}

[0181] Switching_gap1 applies the minimum value of the switching gaps of pattern 1 and pattern 2 in [2-4] above as the switching gap for that Tx switching, while switching_gap2 can be understood as a method that applies the longest switching gap, taking into account as many switching methods as possible.

[0182] [2-5A] (For Tx switching in [2-4] above, (if not configured / instructed to operate in either pattern 1 or pattern 2)) the terminal determines the switching gap to be one of the following:

[0183] - switching_gap1=min{Max{period(A,C),period(B,D)},Max{period(A,D),period(B,C)}}

[0184] - switching_gap2=Max{period(A,C),period(B,D),period(A,D),period(B,C)}

[0185] - switching_gap5-a=Max{period(A,C),period(A,D)}

[0186] - switching_gap5-b=Max{period(B,C),period(B,D)}

[0187] - switching_gap5-c=min{switching_gap5-a,switching_gap5-b}

[0188] - switching_gap5-d=Max{period(A,C),period(B,C)}

[0189] - switching_gap5-e=Max{period(A,D),period(B,D)}

[0190] - switching_gap5-f=min{switching_gap5-d,switching_gap5-e}

[0191] When the switching interval is set to be applied to band A and / or band B, one of switching_gap5-a, switching_gap5-b, and switching_gap5-c is determined as the switching interval.

[0192] When the switching interval is set to be applied to band C and / or band D, one of switching_gap5-d, switching_gap5-e, and switching_gap5-f is determined as the switching interval.

[0193] The terminal reports one (or more) of the above-mentioned methods from "switching_gap1" to "switching_gap5-f" (in a preferred method) by a UE capability signal. One (or more) of the methods from switching_gap1 to switching_gap5-f is configured in the terminal via RRC or the like.

[0194] The switching interval determined as described above is applied to each band in one of the following ways:

[0195] When the switching interval is set to apply to band A and / or band B,

[0196] - Alt-1: For band A, G1=max{period(A,C),period(A,D)} length is determined as the switching section

[0197] - Alt-2: For band B, G2=max{period(B,C),period(B,D)} length is determined as the switching section

[0198] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0199] - Alt-1 is applied to band A, and Alt-2 is applied (independently) to band B. In this case, G1 or G2 is applied (independently) to band A and band B at different times. Alternatively, G1 is applied to band A and G2 is applied to band B at the same time (here, the same time means that the start time or end time of G1 and G2 are the same).

[0200] - The same length min{G1, G2} is applied to band A and band B. In this case, min{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, min{G1, G2} is applied to band A and band B at the same timing.

[0201] - The same length max{G1, G2} is applied to band A and band B. In this case, max{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, max{G1, G2} is applied to band A and band B at the same timing.

[0202] When the switching interval is set to apply to band C and / or band D,

[0203] - Alt-3: For band C, G3=max{period(A,C),period(B,C)} length is determined as the switching interval

[0204] - Alt-4: For band D, G4=max{period(A,D),period(B,D)} length is determined as the switching interval

[0205] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0206] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0207] - Alt-3 is applied to band C, and Alt-4 is applied (independently) to band D. In this case, G3 or G4 is applied (independently) to band C and band D at different times. Alternatively, G3 is applied to band C and G4 is applied to band D at the same time (here, the same time means that the start time or end time of G3 and G4 are the same).

[0208] - The same length min{G3, G4} is applied to bands C and D. In this case, min{G3, G4} is applied (independently) to bands C and D at different timings, or min{G3, G4} is applied to bands C and D at the same timing.

[0209] - The same length max{G3, G4} is applied to bands C and D. In this case, max{G3, G4} is applied (independently) to bands C and D at different times, or max{G3, G4} is applied to bands C and D at the same time.

[0210] [2-6] For the Tx switching of [2-4], whether the UE switches using pattern 1 or pattern 2 is set via RRC. If switching can be performed using either pattern 1 or pattern 2 depending on the implementation of the UE, the base station may not be able to determine the switching gap for the Tx switching to be the same value as that of the UE. For example, if period (A, C), period (B, D), and period (A, D) are all 35 usec and period (B, C) is 210 usec, the switching gap for pattern 1 is determined to be 35 usec and the switching gap for pattern 2 is determined to be 210 usec. Therefore, if the UE actually switches using pattern 1 but the base station assumes 210 usec, or if the UE actually switches using pattern 2 but the base station assumes 35 usec, the switching gaps assumed by the base station and the UE may differ, resulting in reduced resource efficiency or incorrect reception of transmitted data.

[0211] [2-7] For the Tx switching in [2-4], the UE reports whether to use pattern 1 or pattern 2 for switching according to the UE capability. For example, the UE reports the available (or preferred) schemes for its Tx switching as {pattern1, pattern2, both}, where 'both' means that the UE can support both pattern 1 and pattern 2. In this case, if the UE reports 'both' and / or there is no RRC configuration for the switching scheme (disclosed in [2-6]) (or if RRC configuration has not yet been established), the switching gap is determined to be either switching_gap1 or switching_gap2 in [2-5].

[0212] [2-8] For the Tx switching in [2-4], the UE reports the bands to which each Tx chain can (or cannot) be connected according to the UE capabilities. In addition, the UE is configured / instructed via RRC, etc., the bands to which each Tx chain can (or cannot) be connected for each Tx chain. If the UE reports that a certain Tx chain can be connected to all bands and / or there is no RRC configuration for whether each Tx chain can be connected to a band (or if the RRC configuration has not yet been made), the switching gap is determined to be either switching_gap1 or switching_gap2 in [2-5].

[0213] Tx switching case / pattern: A(1T)+B(1T) -> A(1T)+C(1T), or A(1T)+B(1T) -> B(1T)+C(1T)

[0214] [2-9] For a terminal configured with UL Tx switching in three or four bands (e.g., bands A, B, C, and D), when in the A(1T)+B(1T) state, if X(1p)+C(1p) occurs (X means A or B), the terminal will perform Tx switching in one of the following two patterns. (The explanation is based on the assumption that X=B.)

[0215] Pattern 3: Tx in band A is switched to band C, and Tx in band B is maintained in band B. In this case, the switching gap of that Tx switching is determined by period(A,C).

[0216] Pattern 4: Tx in band A is switched to band B, and Tx in band B is switched to band C. In this case, the switching gap for that Tx switching is determined to be Max{period(A,B),period(B,C)}.

[0217] In addition, if one of the terminal's Tx chains (=Tx#1) can be connected to band A and band B but not to band C, and the other Tx chain (=Tx#2) can be connected to band B and band C, when the A(1T)+B(1T) state is a state in which Tx#1 is connected to band A and Tx#2 is connected to band B, the terminal performs its Tx switching according to pattern 4.

[0218] [2-10] For the Tx switching in [2-9] above, the terminal (if not configured / instructed to operate in either pattern 3 or pattern 4) determines the switching gap to be one of the following:

[0219] - switching_gap3 = min{period(A,C),Max{period(A,B),period(B,C)}}

[0220] - switching_gap4 = Max{period(A,C),period(A,B),period(B,C)}

[0221] Switching_gap3 applies the minimum value of the switching gaps of patterns 3 and 4 in [2-9] as the switching gap for that Tx switching, while switching_gap4 can be understood as a method that applies the longest switching gap, taking into account all possible switching methods.

[0222] [2-10A] (For the Tx switching in [2-9] above (when not configured / instructed to operate in either pattern 3 or pattern 4)) the terminal determines the switching gap to be one of the following. (This explanation assumes that X = B. That is, assume that A(1T) + B(1T) -> B(1T) + C(1T). If X = A, the same principle can be applied by substituting A and B in the following method of determining switching_gap.)

[0223] - switching_gap3 = min{period(A,C),Max{period(A,B),period(B,C)}

[0224] - switching_gap4 = Max{period(A,C),period(A,B),period(B,C)}

[0225] - switching_gap6-a = Max{period(A,C),period(A,B)}

[0226] - switching_gap6-b = period(B,C)

[0227] - switching_gap6-c = min{switching_gap6-a,switching_gap6-b}

[0228] - switching_gap6-d= Max{period(A,C),period(B,C)}

[0229] - switching_gap6-e = period(A,B)

[0230] - switching_gap6-f = min{switching_gap6-d,switching_gap6-e}

[0231] When a switching interval is set to be applied to the switch-from band (ie, band A and / or band B), one of switching_gap6-a, switching_gap6-b, and switching_gap6-c is determined as the switching interval.

[0232] When the switching interval is set to be applied to the switch-to band (ie, band B and / or band C), one of switching_gap6-d, switching_gap6-e, and switching_gap6-f is determined as the switching interval.

[0233] The terminal reports one (or more) of the above-mentioned methods from "switching_gap3" to "switching_gap6-f" (in a preferred method) by a UE capability signal. One (or more) of the above-mentioned methods from "switching_gap3" to "switching_gap6-f" is configured in the terminal via RRC or the like.

[0234] The switching interval determined as described above is applied to each band in one of the following ways:

[0235] When the switching interval is set to be applied to the switch-from band (i.e., band A and / or band B),

[0236] - Alt-1: For band A, G1=max{period(A,C),period(A,B)} length is determined as the switching interval

[0237] - Alt-2: For band B, G2 = period(B,C) length is determined as the switching interval.

[0238] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0239] - Alt-1 is applied to band A, and Alt-2 is applied (independently) to band B. In this case, G1 or G2 is applied (independently) to band A and band B at different times. Alternatively, G1 is applied to band A and G2 is applied to band B at the same time (here, the same time means that the start time or end time of G1 and G2 are the same).

[0240] - The same length min{G1, G2} is applied to band A and band B. In this case, min{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, min{G1, G2} is applied to band A and band B at the same timing.

[0241] - The same length max{G1, G2} is applied to band A and band B. In this case, max{G1, G2} is applied (independently) to band A and band B at different timings. Alternatively, max{G1, G2} is applied to band A and band B at the same timing.

[0242] When the switching interval is configured to apply to the switch-to band (i.e., band B and / or band C),

[0243] Alt-3: For band C, G3=max{period(A,C),period(B,C)} length is determined as the switching section.

[0244] Alt-4: For band B, G4 = period(A,B) length is determined as the switching section.

[0245] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0246] - Alt-3 is applied to band C, and Alt-4 is applied (independently) to band D. In this case, G3 or G4 is applied (independently) to band C and band D at different times. Alternatively, G3 is applied to band C and G4 is applied to band D at the same time (here, the same time means that the start time or end time of G3 and G4 are the same).

[0247] - The same length min{G3, G4} is applied to bands C and D. In this case, min{G3, G4} is applied (independently) to bands C and D at different timings, or min{G3, G4} is applied to bands C and D at the same timing.

[0248] - The same length max{G3, G4} is applied to bands C and D. In this case, max{G3, G4} is applied (independently) to bands C and D at different times, or max{G3, G4} is applied to bands C and D at the same time.

[0249] Using that switching interval, the switching interval is applied to each band by one of the following methods (or the terminal reports its preference for one or more of the following methods, and / or one of the following methods is configured in the terminal via RRC, etc.).

[0250] - Alt-3 is applied to band C, and Alt-4 is applied (independently) to band D. In this case, G3 or G4 is applied (independently) to band C and band D at different times. Alternatively, G3 is applied to band C and G4 is applied to band D at the same time (here, the same time means that the start time or end time of G3 and G4 are the same).

[0251] - The same length min{G3, G4} is applied to bands C and D. In this case, min{G3, G4} is applied (independently) to bands C and D at different timings, or min{G3, G4} is applied to bands C and D at the same timing.

[0252] - The same length max{G3, G4} is applied to bands C and D. In this case, max{G3, G4} is applied (independently) to bands C and D at different times, or max{G3, G4} is applied to bands C and D at the same time.

[0253] [2-11] For the Tx switching of [2-9], whether the UE switches using pattern 3 or pattern 4 is set via RRC. If switching can be performed using either pattern 3 or pattern 4 depending on the implementation of the UE, the base station may not be able to determine the switching gap for the Tx switching to be the same value as that of the UE. For example, if period (A, C) is 35 usec and period (A, B) and period (B, C) are 210 usec, the switching gap for pattern 3 is determined to be 35 usec and the switching gap for pattern 4 is determined to be 210 usec. Therefore, if the UE actually switches using pattern 3 but the base station assumes 210 usec, or if the UE actually switches using pattern 4 but the base station assumes 35 usec, the switching gaps assumed by the base station and the UE may differ, resulting in reduced resource efficiency or incorrect reception of transmitted data.

[0254] [2-12] For the Tx switching of [2-9], the UE reports whether to use pattern 3 or pattern 4 for switching according to the UE capability. For example, the UE reports the available (or preferred) schemes for its Tx switching as {pattern3, pattern4, both}, where 'both' means that the UE can support both pattern 3 and pattern 4. In this case, if the UE reports 'both' and / or there is no RRC configuration for the switching scheme (disclosed in [2-11]) (or if the RRC configuration has not yet been made), the switching gap is determined to be either switching_gap3 or switching_gap4 of [2-10].

[0255] [2-13] For the Tx switching of [2-9], the terminal reports the bands to which each Tx chain can (or cannot) be connected according to the UE capabilities. In addition, the bands to which each Tx chain can (or cannot) be connected are configured / instructed to the terminal via RRC, etc. If the terminal reports that a certain Tx chain can be connected to all bands and / or there is no RRC configuration for whether each Tx chain can be connected to a band (or if the RRC configuration has not yet been made), the switching gap is determined to be either switching_gap3 or switching_gap4 of [2-10].

[0256] Furthermore, the calculation principle of switching_gap1 in [2-5] (or switching_gap3 in [2-10]) is not limited to the Tx switching case / pattern in [2-4] (or [2-9]). That is, when two or more band pairs with different reported switching intervals (such as [2-4] and [2-9]) are included in one switching case / pattern, if the Tx switching can be operated in two or more ways, the switching gap at this time is determined to be the minimum value of the switching gaps for each operation way.

[0257] Alternatively, the calculation principle of switching_gap2 in [2-5] (or switching_gap4 in [2-10]) is not limited to the Tx switching case / pattern in [2-4] (or [2-9]). That is, when two or more band pairs with different reported switching intervals (such as [2-4] and [2-9]) are included in one switching case / pattern, if the Tx switching can be operated in two or more ways, the switching gap at this time is determined to be the maximum value of the switching gaps for each operation way.

[0258] [3] A method for limiting the occurrence of consecutive UL Tx switching within a given time period on a switching-pair basis.

[0259] [3-1] The following is one of the characteristics related to UL Tx switching defined in 38.214:

[0260] [Table 8]

[0261] That is, the UE does not expect UTS triggers to occur more than once within one slot length, where one slot is determined based on the SCSs set in the active UL BWPs of the two UL carriers (or bands) corresponding to before / after UTS switching.

[0262] [3-2] Table 8 clearly indicates that if the number of bands configured for UL Tx switching in the terminal is two, two UTSs cannot be triggered consecutively in one slot. On the other hand, if the number of bands configured for UL Tx switching in the terminal is three or more, it is unclear whether any UTSs cannot be triggered consecutively in one slot for all bands configured for UTS (i.e., three or more bands), or whether two UTSs cannot be triggered consecutively in one slot for two bands for which UTSs are triggered (i.e., switch-from band and switch-to band).

[0263] [3-3] As mentioned above, the constraint that consecutive UTSs cannot be triggered within one slot can be implemented in two ways:

[0264] - Alt 1: The UE does not expect any UTS to be triggered consecutively within one slot for any (two) bands configured in the UTS. For example, when three bands (e.g., band A, band B, and band C) are configured in the UTS, after a UTS is triggered between two predetermined bands within one slot, a UTS is not triggered between the same or different predetermined two bands. In this case, the slot refers to the slot length corresponding to the maximum (or minimum) value among the SCSs of the active UL BWPs of all UL bands (or UL carriers) configured in the UTS.

[0265] - Alt 2: The UE does not expect UTS to be triggered consecutively for the same two predetermined bands within one slot. For example, when three bands (e.g., band A, band B, and band C) are configured for UTS, after a UTS is triggered between two predetermined bands within one slot, a UTS is not triggered between the same two bands. However, after a UTS is triggered between two predetermined bands, a UTS may be triggered between two bands of another combination before one slot has elapsed. In this case, the slot refers to the slot length corresponding to the maximum (or minimum) value of the SCS of the active UL BWPs of the two predetermined UL bands (or UL carriers).

[0266] The UE reports either Alt 1 or Alt 2 to the base station according to the UE capability (when three or more bands are configured for UTS). The base station configures / instructs either Alt 1 or Alt 2 to the UE via RRC, MAC-CE, etc. (based on the UE capability of the UE).

[0267] [3-4] Alt 1 and Alt 2 in [3-3] above may be applied only under certain conditions. For example, Alt 1 (or Alt 2) is applied only to [Setting 1] or [Setting 2] disclosed in [1-3]. Or, Alt 1 or Alt 2 is applied only when both Tx chains are switched. For example, when one-port UL transmission occurs in each of two UL bands without a Tx chain connected (or configured) (or when two-port UL transmission occurs in one UL band without a Tx chain connected (or configured)), both Tx chains must be switched. The setting that does not allow consecutive UTS triggers within one slot is defined / set as such switching not occurring consecutively within one slot.

[0268] However, the present invention is not limited to application to transmission and reception of uplink and / or downlink signals. For example, the present invention can also be used in direct communication between terminals. Furthermore, the concept of a base station in the present invention includes not only a base station but also a relay node. For example, the operation of a base station in the present invention may be performed by a base station, or may be performed by a relay node.

[0269] The above-mentioned example of the proposed method is also included as one of the implementation methods of this specification and is therefore recognized as a type of proposed method. The above-mentioned proposed methods may be implemented independently, or may be implemented in the form of a combination (or merging) of some of the proposed methods. Information regarding whether the above-mentioned proposed method is applied (or information regarding the rules of the proposed method) can be notified by the base station to the terminal, or by the transmitting terminal to the receiving terminal via a predetermined signal (e.g., a physical layer signal or an upper layer signal).

[0270] Example

[0271] FIG. 5 is a flowchart illustrating a signal transmission and reception method according to an embodiment of the present invention.

[0272] 5, a signal transmission / reception method according to an embodiment of the present invention is performed by a terminal and includes a step of indicating capability for a switching interval (S501), and a step of performing a first transmission and then a second transmission (S503). A signal transmission / reception method by a base station corresponding to the embodiment of the present invention shown in FIG. 5 includes a step of indicating capability for a switching interval (S501), and a step of receiving a first transmission from a terminal and then a second transmission (S503).

[0273] In addition to the operations of FIG. 5, any one or more of the operations described by [1] to [3] can be performed.

[0274] For example, referring to [1-1] to [1-4], when two Tx chains are connected to a given band, one-port uplink transmission occurs in each of two bands to which no Tx chain is connected. If the UTS gap durations applied to the two bands in which the one-port uplink transmission occurs are different, the maximum of the two UTS gaps is applied to both bands.

[0275] A predetermined band to which two Tx chains are connected is referred to as band A, and two bands in which one-port uplink transmission occurs are referred to as band B and band C, respectively. The capability indicated in step S501 includes information on a switching period AB for the band pair including band A and band B, and a switching period AC for the band pair including band A and band C. The first transmission corresponds to a two-port transmission performed on a carrier of band A, and the second transmission corresponds to a one-port transmission performed on each carrier of band B and band C. A change in the band between the first and second transmissions causes uplink switching in which the Tx chain is changed, and the first and second transmissions are omitted during the switching gap for uplink switching. Referring to the method of [1-4], the switching gap is set to the maximum value of the switching period AB and the switching period AC and applied.

[0276] FIG. 6 illustrates switching intervals related to uplink switching between three bands according to an embodiment of the present invention. Specifically, a switching time mask is illustrated when a UE supports "dualUL" for a band pair including band X and band Y. The RRC parameter "uplinkTxSwitchingOption" provided by the BS to the UE indicates which option is configured for dynamic UL Tx switching for inter-band UL CA or (NG)EN-DC. This RRC parameter is set to "switchedUL" when the network configures Option 1, and to "dualUL" when the network configures Option 2. When the UE configures the RRC value "switchedUL," the UE does not expect / perform one Tx chain to be connected to each of the two bands, or does not expect / perform simultaneous transmission (instruction / configuration) in the two bands even if one Tx chain is connected to each band. Hereinafter, this is referred to as "Option 1 operation being configured." For example, a UE configured for switchedUL does not expect simultaneous transmission of A(1T) and B(1T) to be instructed / configured, and the BS does not instruct / configure the UE to transmit A(1T) and B(1T). If the RRC value of a UE is configured as "dualUL", the UE expects simultaneous transmission in the two bands to be scheduled / configured (or performs the simultaneous transmission) via one Tx chain connected to each of the two bands, and this is hereinafter referred to as the operation of Option 2 being configured.

[0277] Referring to FIG. 6, two transmit antenna connectors are supported for band Z. In the present invention, a transmit antenna connector and a transmitter refer to a transmit chain. In the present invention, Tx chain and Tx are replaced with a transmit antenna connector, a transmitter, or a transmit chain. Band Z in FIG. 6 corresponds to band A described in relation to FIG. 5 in an embodiment, band X in FIG. 6 corresponds to band B in an embodiment, and band Y in FIG. 6 corresponds to band C in an embodiment. One transmitter switches between band X and band Z, and the other transmitter switches between band Y and band Z across the same time. If the length of the switching period for the band pair including band X and band Z (same as switching period AB) is T2 and the length of the switching period for the band pair including band Y and band Z (same as switching period AC) is T3, then during the time period corresponding to the larger of T2 and T3, the UE is not required to transmit on any of the three bands during the time period with the larger one of switching periods T2 and T3, where T2 is the length of the switching period for the band pair of band X and band Z, and T3 is the length of the switching period for the band pair of band Y and band Z. Although it was stated that the UE is not required to transmit on any of bands X, Y, and Z, the time period (switching gap) corresponding to the larger of T2 and T3 is located only in the switch-from band or only in the switch-to band, based on the priority of the three bands.Therefore, during the time interval corresponding to the larger value of T2 or T3, the transmission that is actually omitted is the uplink transmission of band X and band Y or the uplink transmission of band Z.

[0278] Also, referring to [2-5A], a terminal performs one-port transmission on each carrier of band A and band B, and then one-port transmission on each carrier of band C and band D. From the perspective of FIG. 5, the first transmission corresponds to one-port transmission on each carrier of band A and band B, and the second transmission corresponds to one-port transmission on each carrier of band C and band D. One transmitter switches between band A and band C, and another transmitter switches between band B and band D. Or, one transmitter switches between band A and band D, and another transmitter switches between band B and band C.

[0279] In [2-5A], the switching gap is determined taking into consideration both cases. For example, if the switching gap is located in the switch-from band, G1, which is the maximum value among the switching intervals AC and AD, is determined based on band A, and G2, which is the maximum value among the switching intervals BC and BD, is determined based on band B. G1 and G2 may be applied independently to each of the bands, or the maximum or minimum value of G1 and G2 may be applied commonly to bands A and B. As another example, if the switching gap is located in the switch-to band, G3, which is the maximum value among the switching intervals AC and BC, is determined based on band C, and G4, which is the maximum value among the switching intervals AD and BD, is determined based on band D. G3 and G4 may be applied independently to each of the bands, or the maximum or minimum value of G3 and G4 may be applied commonly to bands C and D. Before the first transmission, the terminal can indicate switching capabilities for the switching intervals AC, AD, BC, and BD.

[0280] Also, referring to [2-10A], a terminal performs one-port transmission on each carrier of band A and band B, and then one-port transmission on each carrier of band B and band C. From the perspective of FIG. 5, the first transmission corresponds to one-port transmission on each carrier of band A and band B, and the second transmission corresponds to one-port transmission on each carrier of band B and band C. One transmitter switches between band A and band B, and another transmitter switches between band B and band C. Or, one transmitter switches between band A and band C, and the other transmitter remains in band B without switching.

[0281] In [2-10A], the switching gap is determined taking into consideration both cases. For example, if the switching gap is located in the switch-from band, G1 is determined as the maximum value of the switching intervals AB and AC, based on band A. If a transmitter is maintained in band B, the switching interval does not need to be considered, and G2, determined based on band B, is determined as the value of the switching interval BC. G1 and G2 may be applied independently to each of the bands, or the maximum or minimum value of G1 and G2 may be applied commonly to bands A and B. As another example, if the switching gap is located in the switch-to band, G3, which is the maximum value of the switching intervals AC and BC, based on band C, is determined. If a transmitter is maintained in band B, the switching interval does not need to be considered, and G4, determined based on band B, is determined as the value of the switching interval BC. G3 and G4 may be applied independently to each of the bands, or the maximum or minimum value of G3 and G4 may be applied commonly to bands B and C. Before the first transmission, the terminal can indicate its switching capabilities for the switching intervals AB, AC, and BC.

[0282] Next, referring to [1-5], when two Tx chains are connected to a given band, one-port uplink transmissions may occur in each of two bands to which no Tx chain is connected. If the start times of the one-port uplink transmissions are different from each other, a switching gap is determined based on the transmission with the earlier start time.

[0283] A predetermined band to which two Tx chains are connected is referred to as band C, and two bands in which one-port uplink transmissions occur are referred to as band A and band B, respectively. The capability indicated in step S501 includes information on a switching period AC for the band pair including band A and band C, and a switching period BC for the band pair including band B and band C. The first transmission corresponds to a two-port transmission performed on a carrier of band C, and the second transmission corresponds to a one-port transmission performed on each carrier of band A and band B. A change in the band between the first and second transmissions causes uplink switching, which changes the Tx chain. However, during the switching gap for uplink switching, the first and second transmissions are omitted. Referring to the method of [1-5], the switching gap is the switching period related to the previous transmission in the time domain during one-port transmissions on each carrier of band A and band B, among the switching periods AC and BC (method 2 of [1-5]). Alternatively, during one-port transmission on each carrier of band A and band B, a switching gap is set from the start of the previous transmission in the time domain during a period whose length corresponds to the maximum of the switching intervals AC and BC (method 4 in [1-5]). Alternatively, during one-port transmission on each carrier of band A and band B, a switching gap is set from the start of the previous transmission in the time domain during a period whose length corresponds to the sum of the lengths of the switching intervals AC and BC (method 5 in [1-5]).

[0284] In addition to the operations described in relation to Figures 5 and 6, any one or more of the operations described in Figures 1 to 4 and / or [1] to [3] may be further performed in combination.

[0285] An example of a communication system to which the present invention is applied

[0286] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or flow charts of the present invention disclosed in this specification may be applied to various fields requiring wireless communication / connectivity between devices (e.g., 5G).

[0287] Hereinafter, a more detailed description will be given with reference to the drawings. In the following drawings / description, the same reference numerals indicate the same or corresponding hardware blocks, software blocks or function blocks unless otherwise specified.

[0288] FIG. 7 illustrates a communication system 1 to which the present invention is applied.

[0289] Referring to FIG. 7, a communication system 1 applicable to the present invention includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that communicate using wireless connection technologies (e.g., 5G NR, LTE), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication capabilities, autonomous vehicles, and vehicles capable of vehicle-to-vehicle communication. Here, the vehicles include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital billboards, vehicles, robots, etc. Mobile devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., laptops, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0290] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. The wireless devices 100a to 100f are equipped with AI (Artificial Intelligence) technology, and are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). IoT devices (e.g., sensors) can also communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0291] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f and the base stations 200, and between the base stations 200. Here, the wireless communication / connections are performed using various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, Integrated Access Backhaul (IAB)) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and the base stations, and the base stations, can transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, according to various proposals of the present invention, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed.

[0292] Examples of wireless devices to which the present invention is applied

[0293] FIG. 8 illustrates a wireless device to which the present invention can be applied.

[0294] 8, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals using various wireless access technologies (e.g., LTE, NR). Here, {first wireless device 100, second wireless device 200} corresponds to {wireless devices 100a to 100f, base station 200} and / or {wireless devices 100a to 100f, wireless devices 100a to 100f} in FIG.

[0295] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate first information / signals and then transmits a wireless signal including the first information / signals via the transceiver 106. The processor 102 also receives a wireless signal including second information / signals via the transceiver 106 and then stores information obtained from signal processing of the second information / signals in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as an RF (radio frequency) unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0296] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0297] The hardware elements of the wireless devices 100, 200 are described in more detail below. Without limitation, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed herein and provide them to the one or more transceivers 106, 206. The one or more processors 102, 202 receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and derive the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein.

[0298] The one or more processors 102, 202 may also be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. For example, the one or more processors 102, 202 may include one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be embodied to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202 or may be stored in one or more memories 104, 204 and executed by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this specification may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0299] One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0300] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or flowcharts herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or flowcharts herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 are coupled to one or more antennas 108, 208, and are configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein via the one or more antennas 108, 208. In this specification, one or more antennas may refer to multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing by one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed by one or more processors 102, 202, from baseband signals to RF band signals. For this purpose, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0301] Examples of use of wireless devices to which this invention is applied

[0302] 9 shows another example of a wireless device to which the present invention is applied. The wireless device may be implemented in various forms depending on the use case / service (see FIG. 7).

[0303] 9, wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 8 and are composed of various elements, components, units / parts, and / or modules. For example, the wireless devices 100 and 200 include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102 and 202 and / or one or more memories 104 and 204 in FIG. 8. For example, the transceiver 114 includes one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 in FIG. 8. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls the electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. The control unit 120 also transmits the information stored in the memory unit 130 to an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface, or stores information received from an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface in the memory unit 130.

[0304] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. Wireless devices may be embodied in the form of, but are not limited to, a robot (FIG. 7, 100a), a vehicle (FIG. 7, 100b-1, 100b-2), an XR device (FIG. 7, 100c), a mobile device (FIG. 7, 100d), a home appliance (FIG. 7, 100e), an IoT device (FIG. 7, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a FinTech device (or financial device), a security device, a climate / environment device, an AI server / device (FIG. 7, 400), a base station (FIG. 7, 200), a network node, etc. Wireless devices may be mobile or fixed depending on the use case / service.

[0305] In FIG. 9, the various elements, components, units / sections and / or modules in the wireless devices 100, 200 are all connected to each other by wired interfaces, or at least some are connected wirelessly by a communication section 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) are connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is configured with a set of one or more processors. For example, the control unit 120 is configured with a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 is configured with a RAM (Random Access Memory), a DRAM (Dynamic RAM), a ROM (Read Only Memory), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0306] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0307] 10 is a diagram illustrating an example of a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be embodied as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc.

[0308] 10, a vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 9, respectively.

[0309] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a causes the vehicle or autonomous vehicle 100 to move on the ground. The driving unit 140a includes an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d implements technology for maintaining a lane while driving, technology for automatically adjusting speed such as adaptive cruise control, technology for automatically driving along a predetermined route, technology for automatically setting a route and driving when a destination is set, etc.

[0310] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a driving plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. The communication unit 110 aperiodically obtains the latest traffic information data from an external server during autonomous driving and also obtains surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server can predict traffic information data using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0311] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention. [Industrial Applicability]

[0312] As mentioned above, the present invention can be applied to a variety of wireless communication systems.

Claims

1. A method for a terminal to transmit and receive signals in a wireless communication system, comprising: indicating capabilities for a switching interval AB for a band pair including band A and band B, and a switching interval AC for a band pair including band A and band C; and performing two-port transmission on the carrier of the band A, and then performing one-port transmission on each of the carriers of the band B and the band C; During an uplink switching gap, the two-port transmission on the carrier of the band A or the one-port transmission on each carrier of the band B and the band C is omitted; The uplink switching gap is the maximum value of the switching period AB and the switching period AC. Signal transmission and reception method.

2. Indicating capabilities for the switching interval AC, a switching interval AD for the band pair including band A and band D, a switching interval BC for the band pair including band B and band C, and a switching interval BD for the band pair including band B and band D; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band C and the band D; omitting the one-port transmission on each carrier of the band A and the band B during the second uplink switching gap based on the second uplink switching gap being located in a switch-from band including the band A and the band B; the second uplink switching gap is the maximum or minimum value of G1 and G2; G1 is the maximum value of the switching period AC and the switching period AD, The G2 is the maximum value of the switching interval BC and the switching interval BD. The signal transmitting and receiving method according to claim 1 .

3. Indicating capabilities for the switching interval AC, a switching interval AD for the band pair including band A and band D, a switching interval BC for the band pair including band B and band C, and a switching interval BD for the band pair including band B and band D; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band C and the band D; omitting the one-port transmission on each carrier of the band A and the band B during the second uplink switching gap based on the second uplink switching gap being located in a switch-from band including the band A and the band B; As the second uplink switching gap, G1 is used for the band A and G2 is used for the band B; G1 is the maximum value of the switching period AC and the switching period AD, The G2 is the maximum value of the switching interval BC and the switching interval BD. The signal transmitting and receiving method according to claim 1 .

4. Indicating capabilities for the switching interval AC, a switching interval AD for the band pair including band A and band D, a switching interval BC for the band pair including band B and band C, and a switching interval BD for the band pair including band B and band D; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band C and the band D; omitting the one-port transmission on each carrier of Band C and Band D during the second uplink switching gap based on the second uplink switching gap being located in a switch-to-band including Band C and Band D; the second uplink switching gap is the maximum or minimum value of G3 and G4; G3 is the maximum value of the switching period AC and the switching period BC, G4 is the maximum value of the switching interval AD and the switching interval BD, The signal transmitting and receiving method according to claim 1 .

5. Indicating capabilities for the switching interval AC, a switching interval AD for the band pair including band A and band D, a switching interval BC for the band pair including band B and band C, and a switching interval BD for the band pair including band B and band D; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band C and the band D; omitting the one-port transmission on each carrier of Band C and Band D during the second uplink switching gap based on the second uplink switching gap being located in a switch-to-band including Band C and Band D; As the second uplink switching gap, G3 is used for the band C and G4 is used for the band B; G3 is the maximum value of the switching period AC and the switching period BC, G4 is the maximum value of the switching interval AD and the switching interval BD, The signal transmitting and receiving method according to claim 1 .

6. indicating capabilities for the switching interval AC, a switching interval AB for the band pair including band A and band B, and a switching interval BC for the band pair including band B and band C; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band B and the band C; omitting the one-port transmission on each carrier of the band A and the band B during the second uplink switching gap based on the second uplink switching gap being located in a switch-from band including the band A and the band B; the second uplink switching gap is the maximum or minimum value of G1 and G2; G1 is the maximum value of the switching period AB and the switching period AC, G2 is the value of the switching period BC. The signal transmitting and receiving method according to claim 1 .

7. indicating capabilities for the switching interval AC, a switching interval AB for the band pair including band A and band B, and a switching interval BC for the band pair including band B and band C; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band B and the band C; omitting the one-port transmission on each carrier of the band A and the band B during the second uplink switching gap based on the second uplink switching gap being located in a switch-from band including the band A and the band B; As the second uplink switching gap, G1 is used for the band A and G2 is used for the band B; G1 is the maximum value of the switching period AB and the switching period AC, G2 is the value of the switching period BC. The signal transmitting and receiving method according to claim 1 .

8. indicating capabilities for the switching interval AC, a switching interval AB for the band pair including band A and band B, and a switching interval BC for the band pair including band B and band C; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band B and the band C; omitting the one-port transmission on each carrier of the band B and the band C during the second uplink switching gap based on the second uplink switching gap being located in a switch-to-band including the band A and the band B; the second uplink switching gap is the maximum or minimum value of G3 and G4; G3 is the maximum value of the switching period AB and the switching period AC, G4 is the value of the switching period BC; The signal transmitting and receiving method according to claim 1 .

9. indicating capabilities for the switching interval AC, a switching interval AB for the band pair including band A and band B, and a switching interval BC for the band pair including band B and band C; and performing one-port transmission on each carrier of the band A and the band B, and then performing one-port transmission on each carrier of the band B and the band C; omitting the one-port transmission on each carrier of Band B and Band C during the second uplink switching gap based on the second uplink switching gap being located in a switch-to-band including Band B and Band C; As the second uplink switching gap, G3 is used for the band C and G4 is used for the band B; G3 is the maximum value of the switching period AC and the switching period BC, G4 is the value of the switching period AB. The signal transmitting and receiving method according to claim 1 .

10. performing two-port transmission on the carrier of band C, and then performing one-port transmission on each carrier of band A and band B; During a second uplink switching gap, the one-port transmission on each carrier of the band A and the band B is omitted; The second uplink switching gap is a switching interval associated with a previous transmission in the time domain during the one-port transmission on each carrier of the band A and the band B, among the switching intervals AC and BC for a band pair including the band B and the band C. The signal transmitting and receiving method according to claim 1 .

11. performing two-port transmission on the carrier of band C, and then performing one-port transmission on each carrier of band A and band B; During a second uplink switching gap, the one-port transmission on each carrier of the band A and the band B is omitted; The second uplink switching gap is set during a period having a length equal to the sum of the length of the switching period AC and the length of the switching period BC for a band pair including the band B and the band C. The signal transmitting and receiving method according to claim 1 .

12. The second uplink switching gap is configured from a start point of a previous transmission in the time domain during the one-port transmission on each carrier of the band A and the band B. The signal transmitting and receiving method according to claim 7.

13. A terminal for transmitting and receiving signals in a wireless communication system, comprising: at least one transceiver; at least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform predetermined operations; The predetermined operation is indicating capabilities for a switching interval AB for a band pair including band A and band B, and a switching interval AC for a band pair including band A and band C; and performing two-port transmission on the carrier of the band A, and then performing one-port transmission on each of the carriers of the band B and the band C; During an uplink switching gap, the two-port transmission on the carrier of the band A and the one-port transmission on each carrier of the band B and the band C are omitted; The uplink switching gap is the maximum value of the switching period AB and the switching period AC. Terminal.

14. 1. An apparatus for a terminal, comprising: at least one processor; and and at least one computer memory operatively connected to the at least one processor that, when executed, causes the at least one processor to perform operations, the operations including: indicating capabilities for a switching interval AB for a band pair including band A and band B, and a switching interval AC for a band pair including band A and band C; and performing two-port transmission on the carrier of the band A, and then performing one-port transmission on each of the carriers of the band B and the band C; During an uplink switching gap, the two-port transmission on the carrier of the band A and the one-port transmission on each carrier of the band B and the band C are omitted; The uplink switching gap is the maximum value of the switching period AB and the switching period AC. Device.

15. A computer-readable non-volatile storage medium containing at least one computer program that causes a terminal including at least one processor to perform operations, the operations including: indicating capabilities for a switching interval AB for a band pair including band A and band B, and a switching interval AC for a band pair including band A and band C; and performing two-port transmission on the carrier of the band A, and then performing one-port transmission on each of the carriers of the band B and the band C; During an uplink switching gap, the two-port transmission on the carrier of the band A and the one-port transmission on each carrier of the band B and the band C are omitted; The uplink switching gap is the maximum value of the switching period AB and the switching period AC. Storage medium.

16. 1. A method for transmitting and receiving signals by a base station in a wireless communication system, comprising: receiving from a terminal a capability for a switching interval AB for a band pair including band A and band B, and a capability for a switching interval AC for a band pair including band A and band C; receiving a two-port transmission on the carrier of the band A from the terminal, and then receiving a one-port transmission on each carrier of the band B and the band C from the terminal; During an uplink switching gap, the two-port transmission on the carrier of the band A and the one-port transmission on each carrier of the band B and the band C are omitted; The uplink switching gap is the maximum value of the switching period AB and the switching period AC. Signal transmission and reception method.

17. In a wireless communication system, a base station for transmitting and receiving signals, comprising: at least one transceiver; at least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform predetermined operations; The predetermined operation is receiving from a terminal a capability for a switching interval AB for a band pair including band A and band B, and a capability for a switching interval AC for a band pair including band A and band C; receiving a two-port transmission on the carrier of the band A from the terminal, and then receiving a one-port transmission on each carrier of the band B and the band C from the terminal; During an uplink switching gap, the two-port transmission on the carrier of the band A and the one-port transmission on each carrier of the band B and the band C are omitted; The uplink switching gap is the maximum value of the switching period AB and the switching period AC. Base station.

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